EP0183574B1 - Vhf-uhf broadband amplifier and signal processing device incorporating such, especially for television signals - Google Patents
Vhf-uhf broadband amplifier and signal processing device incorporating such, especially for television signals Download PDFInfo
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- EP0183574B1 EP0183574B1 EP85401876A EP85401876A EP0183574B1 EP 0183574 B1 EP0183574 B1 EP 0183574B1 EP 85401876 A EP85401876 A EP 85401876A EP 85401876 A EP85401876 A EP 85401876A EP 0183574 B1 EP0183574 B1 EP 0183574B1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/191—Tuned amplifiers
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- the present invention relates to an electrical signal amplifier circuit covering a predetermined wide band of frequencies.
- the present invention relates more precisely to the transmission and amplification of signals in the so-called VHF-UHF (Very High Frequency - Ultra High Frequency) bands ranging from 40 MHz to 960 MHz.
- VHF-UHF Very High Frequency - Ultra High Frequency
- the present invention applies in particular to the amplification of television signals, the bandwidth of which covers, for each channel, several Megahertz.
- these conventional amplifier circuits generally comprise an amplifier transistor T, the base of which receives the signal to be amplified via a link capacitor. entry Ci.
- the emitter of transistor T 1 is connected to the ground of the assembly via a resistor R 1 forming a current feedback.
- the collector of transistor T is connected to a positive supply terminal + Vcc via a load resistor R 2 which fixes the bias current of transistor T l , in combination with a bias resistor R 3 , of high value, connecting the collector and the base of transistor T 1 .
- the amplified signal is taken from the collector of transistor T, via a connection capacitor C 2 .
- a voltage feedback loop is connected in parallel to the resistor R 3 between the collector and the base of the transistor T i .
- This feedback loop comprises in series, as shown in FIG. 1, a resistor R 4 of low value - 220 ⁇ for example, a self Si and a capacitor C 3 .
- the present invention now comes to propose a new broadband amplifier circuit for VHF-UHF electrical signals which has in particular noise, transmission gain, linearity and output level characteristics, over the entire band considered, markedly improved compared to to previous achievements.
- the input and output networks are adapted to favor the transmission of electrical signals of the VHF-UHF bands and at least attenuate the electrical signals of frequency lower than the band of use.
- the transistors of the amplifier stages are mounted as a common transmitter.
- the amplifier circuit comprises a circuit for adapting the output consisting of a parallel resistance-capacitance network which connects the collector of the transistor to the output of the amplifier circuit.
- the voltage feedback loop and the input matching network are adapted to fix in combination the input impedance of the amplifier circuit and linearize the response thereof in the lower part of the use band.
- the output matching network fixes the output impedance of the circuit.
- the input matching network comprises two capacitors connected in series between the input of the circuit and the ground, the median common point of the capacitors being connected to the base of the transistor.
- the feedback loop advantageously comprises in series a resistor and a choke.
- the aforementioned amplifier circuit can be produced in hybrid technology.
- the realization of the aforementioned amplifier circuits, in hybrid technology, as proposed by the Applicant, makes it possible in particular to resolve, with good reproducibility, the problems of noise, gain and output level hitherto posed with the amplifier circuits. while maintaining good linearity of the amplitude / frequency response.
- the present invention also relates to devices for processing electrical signals, in particular receiving devices, for example television signals, which comprise at least one amplifier circuit of the aforementioned type.
- the amplifier shown in FIG. 2 is intended to amplify signals from the VHF-UHF bands applied to the input referenced 10 and represented on the left of FIG. 2, the signals amplified by the circuit being taken from the output referenced 20 and shown on the right in Figure 2.
- the input 10 and output 20 connections will preferably be made by coaxial cable.
- FIG. 2 In general, in FIG. 2, one recognizes an amplifier stage comprising a transistor T jo . More specifically, we see in Figure 2 an input matching network formed, according to the embodiment shown, of two capacitors referenced C 20 , C 30 connected in series between the assembly input and ground. More precisely still, the capacitors C 20 and C 30 are connected to the input 10 of the circuit via an input link capacitor C io . The point common to the two capacitors of the adaptation network C 20 , C 30 is connected to the base of the transistor T io .
- the input filter thus formed by the capacitors C 20 and C 30 makes it possible to eliminate the frequencies lower than the band used and on the other hand contributes to linearize the amplitude / frequency response and to fix the input impedance of l amplifier across the band.
- Transistor T 10 is mounted as a common transmitter, said transmitter being connected directly to ground. As previously mentioned, this brings the advantage of a significant increase in the gain of the stage as well as a very appreciable improvement in the noise factor compared to the previous proposals in which the transistors were counter-reacted in current.
- a very high value bias resistor R 20 is connected between the collector and the base of the transistor T io .
- the voltage feedback due to the very high resistance R 20 , is entirely negligible.
- the resistor series assembly R 10 , self S 10 shown in FIG. 2 connected between the collector of transistor T 10 and the common point of the capacitors C 10 , C 20 provides a voltage feedback through the network d input C 20 , C 30 more particularly at frequencies included in the VHF band.
- the presence of S 10 makes it possible to linearize the amplitude-frequency response of the amplifier, and contributes to the adaptation of the input and output impedances of the amplifier.
- the output matching network consisting of the resistor R 40 in parallel with the capacitor C 50 connected between the collector of the transistor T 10 and the output 20 of the amplifier, via a bonding capacitor of C 60 output in series, contributes to linearize the amplitude-frequency response of the amplifier and to adapt the output impedance in the band of use.
- Capacities C 10 and C 60 of high value are used to isolate the amplifier at input and output.
- the resistor R 30 which charges the collector of the transistor T io , and connects the latter to the positive supply voltage + Vcc, in association with the resistor R 20 fixes the bias current of the transistor.
- the positive supply voltage + Vcc is decoupled from ground using a C 40 capacitor.
- the inductive element S 10 Due to the structure of the proposed circuit, the inductive element S 10 has a relatively low inductance which allows the realization of this inductive element in the form of printed circuits. Therefore, according to a very important characteristic of the present invention, the amplifier circuit can be produced in the form of hybrid technology. In addition to exceptional gain and linearity characteristics, the present invention thus makes it possible to obtain a noise factor and an output level very close to those announced by the manufacturers for the transistors.
- the fields of application of the amplifier circuit according to the present invention are in particular the reception and processing of the signals of the VHF-UHF bands (40-960 MHz).
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Abstract
Description
La présente invention concerne un circuit amplificateur de signaux électriques couvrant une large bande prédéterminée de fréquences.The present invention relates to an electrical signal amplifier circuit covering a predetermined wide band of frequencies.
La présente invention concerne plus précisément la transmission et l'amplification de signaux dans les bandes dites VHF-UHF (Very High Frequency - Ultra High Frequency) allant de 40 MHz à 960 MHz.The present invention relates more precisely to the transmission and amplification of signals in the so-called VHF-UHF (Very High Frequency - Ultra High Frequency) bands ranging from 40 MHz to 960 MHz.
La présente invention s'applique en particulier à l'amplification de signaux de télévision, dont la largeur de bande couvre, pour chaque canal, plusieurs Megahertz.The present invention applies in particular to the amplification of television signals, the bandwidth of which covers, for each channel, several Megahertz.
L'invention sera décrite par la suite dans le cadre de cette application aux signaux de télévision sans que cette application toutefois puisse être considérée comme limitative.The invention will be described below in the context of this application to television signals without this application however being able to be considered as limiting.
D'une façon générale, il serait souhaitable de disposer de circuits amplificateurs large bande opérant dans les bandes VHF-UHF.In general, it would be desirable to have broadband amplifier circuits operating in the VHF-UHF bands.
On a déjà proposé différents circuits amplificateurs à large bande notamment sous forme de circuits hybrides, adaptés pour la transmission de signaux des bandes VHF-UHF.Various broadband amplifier circuits have already been proposed, in particular in the form of hybrid circuits, suitable for the transmission of signals from the VHF-UHF bands.
De tels circuits sont par exemple décrits dans le manuel « Wideband Transistors and Wideband Hybrid IC Modules •, Sept. 81 édité par Philips.Such circuits are for example described in the manual “Wideband Transistors and Wideband Hybrid IC Modules •, Sept. 81 edited by Philips.
Comme cela est représenté sur la figure 1 annexée, qui illustre l'état de la technique, ces circuits amplificateurs classiques comprennent généralement un transistor amplificateur T, dont la base reçoit le signal à amplifier par l'intermédiaire d'un condensateur de liaison d'entrée Ci.As shown in the appended FIG. 1, which illustrates the state of the art, these conventional amplifier circuits generally comprise an amplifier transistor T, the base of which receives the signal to be amplified via a link capacitor. entry Ci.
L'émetteur du transistor T1 est relié à la masse du montage par l'intermédiaire d'une résistance R1 formant contre-réaction en courant. Le collecteur du transistor T, est relié à une borne d'alimentation positive + Vcc par l'intermédiaire d'une résistance de charge R2 qui fixe le courant de polarisation du transistor Tl, en combinaison avec une résistance R3 de polarisation, de forte valeur, reliant le collecteur et la base du transistor T1.The emitter of transistor T 1 is connected to the ground of the assembly via a resistor R 1 forming a current feedback. The collector of transistor T, is connected to a positive supply terminal + Vcc via a load resistor R 2 which fixes the bias current of transistor T l , in combination with a bias resistor R 3 , of high value, connecting the collector and the base of transistor T 1 .
Le signal amplifié est prélevé sur le collecteur du transistor T, par l'intermédiaire d'un condensateur de liaison C2.The amplified signal is taken from the collector of transistor T, via a connection capacitor C 2 .
Enfin, une boucle de contre-réaction en tension est branchée en parallèle sur la résistance R3 entre le collecteur et la base du transistor Ti. Cette boucle de contre-réaction comprend en série, comme représenté sur la figure 1, une résistance R4 de faible valeur - 220 Ω par exemple, une self Si et un condensateur C3.Finally, a voltage feedback loop is connected in parallel to the resistor R 3 between the collector and the base of the transistor T i . This feedback loop comprises in series, as shown in FIG. 1, a resistor R 4 of low value - 220 Ω for example, a self Si and a capacitor C 3 .
Un grand nombre de ces circuits a déjà été utilisé.Many of these circuits have already been used.
On constate cependant, dans la pratique que les systèmes jusqu'ici proposés ne donnent pas entière satisfaction dans la mesure, en particulier où leur facteur de bruit limite de façon importante leur utilisation dans les dispositifs de réception. De ce fait, il était nécessaire jusqu'ici, dans la plupart des cas, d'adjoindre un étage supplémentaire à faible bruit, au circuit précédemment décrit.However, it has been observed in practice that the systems hitherto proposed are not entirely satisfactory to the extent, in particular where their noise factor significantly limits their use in reception devices. Therefore, it has hitherto been necessary, in most cases, to add an additional low-noise stage to the circuit previously described.
Le document « Instruments and Experimental Techniques», vol. 15, n° 3, partie 1, mai-juin 1972, pages 768-769 décrit un amplificateur à large bande de signaux électriques, notamment pour le canal de déviation verticale d'un oscilloscope, qui comprend un ensemble amplificateur pourvu d'un étage amplificateur à transistor non contre-réactionné en courant et d'un réseau d'adaptation d'entrée, ainsi qu'un réseau d'adaptation de sortie.The document "Instruments and Experimental Techniques", vol. 15, No. 3, part 1, May-June 1972, pages 768-769 describes a broadband amplifier of electrical signals, in particular for the vertical deflection channel of an oscilloscope, which comprises an amplifier assembly provided with a stage transistor amplifier not current feedback and an input matching network, as well as an output matching network.
La présente invention vient maintenant proposer un nouveau circuit amplificateur large bande de signaux électriques VHF-UHF qui présente en particulier des caractéristiques de bruit, de gain de transmission, de linéarité et de niveau de sortie, sur toute la bande considérée, nettement améliorées par rapport aux réalisations antérieures.The present invention now comes to propose a new broadband amplifier circuit for VHF-UHF electrical signals which has in particular noise, transmission gain, linearity and output level characteristics, over the entire band considered, markedly improved compared to to previous achievements.
A cet effet, la présente invention propose un circuit amplificateur large bande de signaux électriques VHF-UHF qui comprend de façon connue en soi au moins :
- un ensemble amplificateur comportant
- un étage amplificateur à transistor non contre-réactionné en courant dans la bande d'utilisation, et
- un réseau d'adaptation d'entrée,
- un réseau d'adaptation de sortie, caractérisé en ce qu'une boucle de contre-réaction en tension agit sur l'ensemble amplificateur composé de l'étage amplificateur à transistor et du réseau d'adaptation d'entrée.
- an amplifier assembly comprising
- a transistor amplifier stage which is not counter-reacted with current in the use band, and
- an input adaptation network,
- an output matching network, characterized in that a voltage feedback loop acts on the amplifier assembly composed of the transistor amplifier stage and the input matching network.
Selon l'invention, les réseaux d'entrée et de sortie sont adaptés pour favoriser la transmission de signaux électriques des bandes VHF-UHF et atténuer au moins les signaux électriques de fréquence inférieure à la bande d'utilisation.According to the invention, the input and output networks are adapted to favor the transmission of electrical signals of the VHF-UHF bands and at least attenuate the electrical signals of frequency lower than the band of use.
La Demanderesse a ainsi remarqué qu'en utilisant des étages amplificateurs à transistors non- contre réactionnés en courant, à l'opposé des réalisations antérieures qui proposaient des contre-réactions sur lesdits étages amplificateurs, et dans la grande majorité des cas, des contre-réactions simultanément en tension et en courant, les caractéristiques de bruit et de gain des circuits amplificateurs étaient très nettement améliorées.The Applicant has thus noticed that by using amplifier stages with transistors not counter-reacted in current, in contrast to the previous embodiments which proposed feedback on said amplifier stages, and in the vast majority of cases, Both voltage and current reactions, the noise and gain characteristics of the amplifier circuits were very much improved.
En outre, et surtout le fait d'inclure le réseau d'adaptation d'entrée dans la boucle de contre-réaction en tension, selon l'invention, permet de linéariser la réponse amplitude/fréquence du circuit amplificateur sur une gamme de fréquences aussi large que les bandes VHF-UHF.In addition, and above all the fact of including the input matching network in the voltage feedback loop, according to the invention, makes it possible to linearize the amplitude / frequency response of the amplifier circuit over a range of frequencies as well. wider than the VHF-UHF bands.
Selon une caractéristique avantageuse de la présente invention, les transistors des étages amplificateurs sont montés en émetteur commun.According to an advantageous characteristic of the present invention, the transistors of the amplifier stages are mounted as a common transmitter.
Selon une autre caractéristique avantageuse de l'invention, le circuit amplificateur comprend un circuit d'adaptation de la sortie constitué d'un réseau parallèle résistance-capacité qui relie le collecteur du transistor à la sortie du circuit amplificateur. Cette disposition permet notamment d'obtenir une bonne linéarité du circuit amplificateur, en optimisant le gain aux fréquences élevées de la bande UHF.According to another advantageous characteristic of the invention, the amplifier circuit comprises a circuit for adapting the output consisting of a parallel resistance-capacitance network which connects the collector of the transistor to the output of the amplifier circuit. This provision allows in particular ment to obtain a good linearity of the amplifier circuit, by optimizing the gain at high frequencies of the UHF band.
De façon avantageuse, la boucle de contre-réaction en tension et le réseau d'adaptation d'entrée sont adaptés pour fixer en combinaison l'impédance d'entrée du circuit amplificateur et linéariser la réponse de celui-ci dans la partie inférieure de la bande d'utilisation. Le réseau d'adaptation de sortie fixe l'impédance de sortie du circuit.Advantageously, the voltage feedback loop and the input matching network are adapted to fix in combination the input impedance of the amplifier circuit and linearize the response thereof in the lower part of the use band. The output matching network fixes the output impedance of the circuit.
Par ailleurs, de façon préférentielle, le réseau d'adaptation d'entrée comprend deux capacités connectées en série entre l'entrée du circuit et la masse, le point commun médian des capacités étant relié à la base du transistor.Furthermore, preferably, the input matching network comprises two capacitors connected in series between the input of the circuit and the ground, the median common point of the capacitors being connected to the base of the transistor.
La boucle de contre-réaction comprend avantageusement en série une résistance et une self.The feedback loop advantageously comprises in series a resistor and a choke.
En outre, selon une caractéristique très importante de la présente invention, le circuit amplificateur précité pourra être réalisé en technologie hybride. La réalisation des circuits amplificateurs précités, en technologie hybride, comme cela est proposé par la Demanderesse, permet en particulier de résoudre, avec une bonne reproductibilité, les problèmes de bruit, de gain et de niveau de sortie jusqu'ici posés avec les circuits amplificateurs classiques, tout en conservant une bonne linéarité de la réponse amplitude/fréquence.In addition, according to a very important characteristic of the present invention, the aforementioned amplifier circuit can be produced in hybrid technology. The realization of the aforementioned amplifier circuits, in hybrid technology, as proposed by the Applicant, makes it possible in particular to resolve, with good reproducibility, the problems of noise, gain and output level hitherto posed with the amplifier circuits. while maintaining good linearity of the amplitude / frequency response.
Enfin, on remarquera que la présente invention concerne également les dispositifs de traitement de signaux électriques, en particulier des dispositifs de réception, par exemple de signaux de télévision, qui comprennent au moins un circuit amplificateur du type précité.Finally, it will be noted that the present invention also relates to devices for processing electrical signals, in particular receiving devices, for example television signals, which comprise at least one amplifier circuit of the aforementioned type.
D'autres caractéristiques et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui va suivre et en regard des dessins annexés donnés à titre d'exemple non limitatif, sur lesquels, la figure 1 qui illustre l'état de la technique ayant déjà été décrite,
- la figure 2 représente le schéma général d'un circuit amplificateur conforme à la présente invention,
- la figure 3 représente en trait plein un graphe illustrant le gain ,(mesuré en dB) en fonction de la fréquence exprimée en MHz d'un circuit amplificateur conforme à la présente invention et représente en traits interrompus un graphe semblable obtenu avec un circuit amplificateur classique.
- FIG. 2 represents the general diagram of an amplifier circuit according to the present invention,
- FIG. 3 represents in solid lines a graph illustrating the gain, (measured in dB) as a function of the frequency expressed in MHz of an amplifier circuit according to the present invention and represents in broken lines a similar graph obtained with a conventional amplifier circuit .
L'amplificateur représenté sur la figure 2 est destiné à amplifier des signaux des bandes VHF- UHF appliqués sur l'entrée référencée 10 et représentée sur la gauche de la figure 2, les signaux amplifiés par le circuit étant prélevés sur la sortie référencée 20 et représentée sur la droite de la figure 2. Bien entendu, les connexions d'entrée 10 et de sortie 20 seront de préférence réalisées par câble coaxial.The amplifier shown in FIG. 2 is intended to amplify signals from the VHF-UHF bands applied to the input referenced 10 and represented on the left of FIG. 2, the signals amplified by the circuit being taken from the output referenced 20 and shown on the right in Figure 2. Of course, the
D'une façon générale, on reconnaît sur la figure 2, un étage amplificateur comportant un transistor Tjo. Plus précisément, on aperçoit sur la figure 2 un réseau d'adaptation d'entrée formé, selon le mode de réalisation représenté, de deux capacités référencées C20, C30 connectées en série entre l'entrée du montage et la masse. Plus précisément encore, les capacités C20 et C30 sont reliées à l'entrée 10 du circuit par l'intermédiaire d'une capacité de liaison d'entrée Cio. Le point commun aux deux capacités du réseau d'adaptation C20, C30 est relié à la base du transistor Tio. Le filtre d'entrée ainsi formé par les capacités C20 et C30 permet d'éliminer les fréquences inférieures à la bande utilisée et d'autre part contribue à linéariser la réponse amplitude/fréquence et à fixer l'impédance d'entrée de l'amplificateur dans toute la bande. Le Transistor T10 est monté en émetteur commun, ledit émetteur étant connecté directement à la masse. Comme cela a été précédemment évoqué, ceci apporte comme avantage une augmentation importante du gain de l'étage ainsi qu'une amélioration très sensible du facteur de bruit par rapport aux propositions antérieures dans lesquelles les transistors étaient contre- réactionnés en courant.In general, in FIG. 2, one recognizes an amplifier stage comprising a transistor T jo . More specifically, we see in Figure 2 an input matching network formed, according to the embodiment shown, of two capacitors referenced C 20 , C 30 connected in series between the assembly input and ground. More precisely still, the capacitors C 20 and C 30 are connected to the
Une résistance de polarisation R20 de très forte valeur est branchée entre le collecteur et la base du transistor Tio.A very high value bias resistor R 20 is connected between the collector and the base of the transistor T io .
La contre-réaction en tension, due à la résistance R20 de très forte valeur, est tout à fait négligeable. Par contre, l'ensemble série résistance R10, self S10 représenté sur la figure 2 connecté entre le collecteur du transistor T10 et le point commun des capacités C10, C20 apporte une contre-réaction de tension au travers du réseau d'entrée C20, C30 plus particulièrement aux fréquences comprises dans la bande VHF. Dans la bande UHF, la présence de S10 permet de linéariser la réponse amplitude-fréquence de l'amplificateur, et contribue à l'adaptation des impédances d'entrée et de sortie de l'amplificateur.The voltage feedback, due to the very high resistance R 20 , is entirely negligible. On the other hand, the resistor series assembly R 10 , self S 10 shown in FIG. 2 connected between the collector of transistor T 10 and the common point of the capacitors C 10 , C 20 provides a voltage feedback through the network d input C 20 , C 30 more particularly at frequencies included in the VHF band. In the UHF band, the presence of S 10 makes it possible to linearize the amplitude-frequency response of the amplifier, and contributes to the adaptation of the input and output impedances of the amplifier.
Enfin, le réseau d'adaptation de sortie constitué de la résistance R40 en parallèle avec la capacité C50 connecté entre le collecteur du transistor T10 et la sortie 20 de l'amplificateur, par l'intermédiaire d'une capacité de liaison de sortie C60 en série, contribue à linéariser la réponse amplitude- fréquence de l'amplificateur et à adapter l'impédance de sortie dans la bande d'utilisation.Finally, the output matching network consisting of the resistor R 40 in parallel with the capacitor C 50 connected between the collector of the transistor T 10 and the
Les capacités C10 et C60 de forte valeur servent à isoler l'amplificateur en entrée et en sortie.Capacities C 10 and C 60 of high value are used to isolate the amplifier at input and output.
La résistance R30, qui charge le collecteur du transistor Tio, et relie celui-ci à la tension positive d'alimentation + Vcc, en association avec la résistance R20 fixe le courant de polarisation du transistor.The resistor R 30 , which charges the collector of the transistor T io , and connects the latter to the positive supply voltage + Vcc, in association with the resistor R 20 fixes the bias current of the transistor.
La tension positive d'alimentation + Vcc est découplée à la masse grâce à une capacité C40.The positive supply voltage + Vcc is decoupled from ground using a C 40 capacitor.
En raison de la structure du circuit proposé, l'élément selfique S10 présente une inductance relativement faible ce qui autorise la réalisation de cet élément selfique sous forme de circuits imprimés. De ce fait, selon une caractéristique très importante de la présente invention, le circuit amplificateur peut être réalisé sous forme de technologie hybride. Outre des caractéristiques de gain et de linéarité exceptionnelles, la présente invention permet ainsi d'obtenir un facteur de bruit et un niveau de sortie très proches de ceux annoncés par les constructeurs pour les transistors.Due to the structure of the proposed circuit, the inductive element S 10 has a relatively low inductance which allows the realization of this inductive element in the form of printed circuits. Therefore, according to a very important characteristic of the present invention, the amplifier circuit can be produced in the form of hybrid technology. In addition to exceptional gain and linearity characteristics, the present invention thus makes it possible to obtain a noise factor and an output level very close to those announced by the manufacturers for the transistors.
Les domaines d'application du circuit amplificateur conforme à la présente invention sont notamment la réception et le traitement des signaux des bandes VHF-UHF (40-960 MHz).The fields of application of the amplifier circuit according to the present invention are in particular the reception and processing of the signals of the VHF-UHF bands (40-960 MHz).
Selon un mode de réalisation particulier, non limitatif, à un étage amplificateur d'un circuit amplificateur conforme à la présente invention :
- le transistor T10 est du type BFR 91A ou BFR 93A commercialisé par RTC,
- les condensateurs C10 à C60 ont les valeurs suivantes :
- les résistances R10 à R4o ont les valeurs suivantes :
- the transistor T 10 is of the BFR 91A or BFR 93A type marketed by RTC,
- capacitors C 10 to C 60 have the following values:
- resistors R 10 to R 4o have the following values:
Ce circuit amplificateur a permis d'obtenir les performances suivantes :
- gain : 10 dB ± 1 dB dans la bande 40-960 MHz (comme cela est représenté sur la figure 3),
- facteur de bruit : F ≤ 3 dB dans la bande 100-960 MHz,
- niveau de sortie : 107 dBµV à - 52 dB d'inter- modulation d'ordre 3 (mesuré à 3 porteuses dont 2 atténuées de 6 dB).
- gain: 10 dB ± 1 dB in the 40-960 MHz band (as shown in Figure 3),
- noise factor: F ≤ 3 dB in the 100-960 MHz band,
- output level: 107 dBµV at - 52 dB of order 3 inter-modulation (measured with 3 carriers, 2 of which are attenuated by 6 dB).
Bien entendu, la présente invention n'est pas limitée au mode de réalisation décrit mais s'étend à toute variante conforme à son esprit, en particulier on notera qu'un nombre d'étages supérieur à un est susceptible d'être retenu.Of course, the present invention is not limited to the embodiment described but extends to any variant in accordance with its spirit, in particular it will be noted that a number of stages greater than one is likely to be retained.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT85401876T ATE43210T1 (en) | 1984-09-27 | 1985-09-25 | VHF-UHF WIDE BAND AMPLIFIER AND SIGNAL PROCESSING EQUIPMENT INCLUDING THESE, ESPECIALLY FOR TELEVISION SIGNALS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8414863 | 1984-09-27 | ||
| FR8414863A FR2570901A1 (en) | 1984-09-27 | 1984-09-27 | PERFECTED VHF-UHF BROADBAND AMPLIFIER AND SIGNAL PROCESSING DEVICE INCORPORATING THE SAME, IN PARTICULAR FOR TELEVISION SIGNALS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0183574A1 EP0183574A1 (en) | 1986-06-04 |
| EP0183574B1 true EP0183574B1 (en) | 1989-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85401876A Expired EP0183574B1 (en) | 1984-09-27 | 1985-09-25 | Vhf-uhf broadband amplifier and signal processing device incorporating such, especially for television signals |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0183574B1 (en) |
| AT (1) | ATE43210T1 (en) |
| DE (1) | DE3570336D1 (en) |
| FR (1) | FR2570901A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3204192A (en) * | 1961-02-15 | 1965-08-31 | Westinghouse Electric Corp | Low insertion loss unilateralization structure |
| US4225827A (en) * | 1979-02-21 | 1980-09-30 | Harris Corporation | Stabilization circuit for transistor RF power amplifiers |
| US4465979A (en) * | 1982-10-08 | 1984-08-14 | Fred S. Eichelberger | UHF antenna amplifier having planar transformers |
-
1984
- 1984-09-27 FR FR8414863A patent/FR2570901A1/en active Pending
-
1985
- 1985-09-25 DE DE8585401876T patent/DE3570336D1/en not_active Expired
- 1985-09-25 AT AT85401876T patent/ATE43210T1/en not_active IP Right Cessation
- 1985-09-25 EP EP85401876A patent/EP0183574B1/en not_active Expired
Non-Patent Citations (1)
| Title |
|---|
| JOURNAL OF THE INSTITUTION OF ELECTRONICS AND TELECOMMUNICATION ENGINEERS, vol. 21, no. 12, décembre 1975, pages 645-648, The Institution of Electronics and Telecommunication Engineers, New Delhi, IN; M.L. SHARMA et al.: "Low-noise transistor amplifier for troposcatter communication system" * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0183574A1 (en) | 1986-06-04 |
| FR2570901A1 (en) | 1986-03-28 |
| ATE43210T1 (en) | 1989-06-15 |
| DE3570336D1 (en) | 1989-06-22 |
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